html: add passthru version that works with appengine

html.go

@@ -1,3 +1,5 @@
+// +build !appengine
+
 package docconv
 
 import (

html_appengine.go

@@ -0,0 +1,18 @@
+// +build appengine
+
+package docconv
+
+import (
+	"io"
+	"io/ioutil"
+	"log"
+)
+
+func HTMLReadability(r io.Reader) []byte {
+	b, err := ioutil.ReadAll(r)
+	if err != nil {
+		log.Printf("HTMLReadability: %v", err)
+		return nil
+	}
+	return b
+}